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Metal Detector

Discussion in 'Electronic Design' started by paul, Oct 28, 2003.

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  1. paul

    paul Guest

    Does anyone have any experience with metal detector circuits ?

    I have a circuit for a BFO type detector but have read that this
    design is quite old and that 'pulse induction' designs are considered
    far better.

    I also have a design for a detector which uses a faraday shield on the
    coil. The design states this has to be constructed using 'tin' foil,
    and not 'aluminium foil'. Is this correct ?

    Any circuit ideas would be appreciated.


    Paul Smith
  2. I read in that paul <>
    Almost certainly not. Tin has a much higher resistivity than aluminium,
    so it just MIGHT be that the coil Q is OK with tin but not aluminium.
    You can solder to tin, of course, if you use a very cool soldering iron.
    But where could you get (and afford!) real tin foil these days?
  3. Tweetldee

    Tweetldee Guest

    Gary Lecomte has a pulse induction metal detector project at It appears to be a
    pretty solid design. I've started collecting the parts for the project, but
    haven't started building it yet.
    Tweetldee at att dot net (Just subsitute the appropriate characters in the

    Never take a laxative and a sleeping pill at the same time!!
  4. Ian Stirling

    Ian Stirling Guest

    You can hammer out lead-free plumbing solder pretty easily.
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